Sewing machine



I. KORNAS.

szwme MACHINE.

APPLICATION FILED AUG-2, 1920.

Lgfiflgg Emma NW, 211 11.922

3 shins-sum 1. N

3. KORNAS. SEWING MACHINE-' APPLICATION men nus-2, I920.

MW M m w P 94% M llllll Patented Nov. 21, 1922.

unirsn stares JOSEPH KORNAS, OF LINDEN, NEW JERSEY, ASSIGNORTO FELDIVIANMACHINE WORKS,

INC., A CORPORATION OF NEW YORK.

, SEWING MACHINE.

Application filed August 2, 1920. Serial No. {100,635. b

To aZZ whom it concern:

I Be it known that I, JOSEPH KonNAs, a citizen of the United States, andresident of Linden, in the county. of Union and State of New Jersey,have invented certain new and useful Improvements in Sewing Machines, ofwhich the following is a specification.

The invention relates in general to certain improvements in sewingmachines of the type identified in the trade as wiring machines of thezigzag stitch commonly for use in forming diagonal or cross stitching.

The primary object-of the invention is to provide a simplified form ofconstruction of such machines in which the number of parts heretoforefound necessaryin similar machines have been reduced in number withincident economy in manufacturing cost.

Another object of the invention .is to provide such a construction inwhich compactness of parts have been featured, so as to reach ,intoconfined spaces in small sized hats, and other structures upon which itis desired to operate, and at the same time to provide in such limited,constructions a rigidity andruggedness of parts to withstand the severestrains incidental to the use of such machines in factory Work where themachines are run at high speed.

It is understood that such machines nec-. essarily comprising a numberof reciprocating parts. are apt to set up vibration and rattleespecially when man high speed. This vibration tends in known forms ofsuch machines to loosen and wear the parts all of which gives rise to anunpleasant noise! which makes such machinesunpopular with the operators.v,

\ccordingly, another object of the invention is to provide a type ofmachine of the class outlined in. whichmovable parts are nicelybalanced, securely. journallcd to fix the.axisofrotation andinter-driven in a manner to minimize looseness of play and noise. 1

WVith this object in view the disclosure features a construction inwhich the rotat ing shafts are provided with long or spaced apartbearings; reciprocating members are closely guided in their movement andat the same time wearing surfaces have been mini mized as far as ispracticable. I

Still another object of the invention is to provide. a form ofconstruction in which necessary adjustment maybe made quickly,

.the invention will be'in part obvious from an inspectlon of theaccompanying drawings and in part will be more fully set forth in thefollowing particular description of one form of mechanism embodying myinvention, and the invention also consists in certain new and novelfeatures of construction and combination of parts hereinafter .set forthand claimed.

In the accompanying drawings.:

Figure 1 is a View in front elevation of a machine of the classdescribed including preferred physical embodiments of the invention.

Figure 2 is a horizontal sectional View taken on the line 22 of Figure 1and showing most of the novel elements of the ma- 1 chine in plan.

Figure 3 is a vertical sectional view taken axially of the main shaftand taken on the line 3-3 of Figure 2.

Figure 4 is an enlarged detail view in axial section of a part of themain shaft and taken on the line 4.--4 of Figure 5.

Figure 5 is .a transverse sectional view taken on the line 5--5 ofFigure 4.

Figure 6 is an enlarged view partlyin section of the needle rocker barframe adjustment taken on the line 6-6 of Figure 1.

In the following description and in the claims, parts will be identifiedby specific names for convenience of expression but they are intendedtobe as generic in their application to similar parts as the art willpermit. V

The device illustrated follows along somewhat conventional designs ofthe zigzag type of sewing machine now known and. includes a supportingbase 10, frame 11, to gether with the usual arm 12, which supports theworking parts of the machine. A. main shaft 13 is mounted in spacedapart bearings 14 and 15 constituting massive parts of the frame and isprovided with the usual driving pulley 16,'eccentric 17, which, throughthe pitman 18, lever 19 and link 20 imparts to the needle bar 21, itsvertical or substantially vertical reciprocation. The needle bar 21 isarranged to carry the needle 22 and is mounted to reciprocate in asubstantially vertical direction in a needle bar frame; It is understoodthat; the needle bar hereinafter'n ore fully'described' The opposite endof'the link isj p'ivo'ted'bymeans of the pin and 'slotconnection 27 tothe upperend of a vertically disposedlev'er 28 which lever'is fulcrumedintermediate its length on the 'pin 29 constituting aihori frame 23mounted to oscillate in a plane parallel with the arm about pivot pin 24defining a horizontal axis of swing of the frame is oscillated sothat-the needle shall be directed first to one side and then the otherside of its normal positionby' means of a link 25, one end of which ispivoted to the needle bar frame adjacent to its upper end through an'adjusting connection 26 zontallyf' projecting" extension from I theframe 11' of the machine.

" The main shaft, or at least) that aortion thereof wh'ich prbjeasthrough the caring "'15, is hollowed as shown in Figure 3 and a'relatively long solid looper shaft 30 is slidaloly mounted in the hollowportion and extends beyond the end thereofand beyond the forward face81'of the bearing 15[ which extended portion is provided withthe usuallooper 32 ,"dis'posed 'inthe usual operative relation to the needle. 7The looper'sh'aft reciprocated axially in the. main shaft by thelever 28which has a roller 33 pivoted to the lower end thereof (showniii Eigure2) fitting,- in aperipheral groove 3 l'f'ormed ,in a split collar 35slidah'ly,mountedon the" main shaft? The lever 28. is'providedintermediate its ends with' a pair of laterally extending parallelfl andvertically ;spaced apart bearing fianges 36 and"3 7 positioned onopposite sides of a cam suppo rting post '38 extending forwardly from'thefi.am e ll A cam member 39 is rotatably mounted uponthe post 38 andis provided with a barrel, cam 40 which: engages between the lfiahgesand rocksthe'lever as the carn 'inem- ,bei' is rotatedj-The'cam memberis pro-.

vided with a relatively large gear ll which ,is disposed at right anglesto and meshes fwithalgearltQ on the main shaftsoas to be driven thereby;The gears 41 v a'n'd lZ form aireducing gear train and to fe ature thedesideratum' forsmooth runninggears the teeth of-the members are of theherring bone type,

' The collar 35 is pinned directly"tothe' 'looper shaft (Figure 5) by'means of a screw pin 43 which screw is passed through a slot 4% formedin theniain shaft. I

One of the features of this disclosure is to provide a broad bearingsurface between the .sleeve and the driving shaft and for thispurposethesh'aftis provided on oneside with a'fiat surface'45 and the sleeve 1ispartially split in advanceoftheggro'ove ,to form a segmental-piece 4 6with 'a flat surface engaging the flatjsurface on the main shaft so asto extend over a materialstructures.

area thereof. Thedsegmental: :piece is secured in position by'rneans' ofset screws 47. It is understood that the fiat surface 4E5 extendslen-gthwise lof -the ;Ir l ain .shaftsfor a distance to accommodate thesleeve in its limit'of movement in both directions under lthe reciprocatory action of the lever 28.

The portion of the main shaftimmediately -in'-a'd'v'ance*of theflattened portion is provided with a relatively, short eccentric cam {8for actuating a feeder reciprocating mechanism49 secured to the feeder50 as is usual in such constructions. The length of th'e cam is limitedto the width of; the arm "49"engaged thereby and is providedjon'its leftside with a bearing-flange e8. ,A lscrew 50 is passedthrough the thickpart of" the eccentric cam and intothe main shaft. so

as to transmit rotary movement"frondthe shaft to the cam. "The portionof theshaft' plate guideway 54 within which? is fittedthe body portion55 of aneedle-'plateifid therear end er whichplate is provided with adepend-ingpin 57' designed-to engage in the groove 58 formed on thesleeve '52. "The forward end of the needle plate is provided withan'upwardly extending projectionfiil.

provided with a needle) receiving hole-"60. The needl Plate isdemountably held in position by meansof a- 'work'plate 6l-fastened tothebearing '15 by' ineans of locating pins 62 anda set screw-'engaging' thescrew hole 63.'The work plate extends'forwardly ofthe bearing *15 soasto overlap the feeder and looper as'is usual in such Thework plateconstitutes a means for'securing'the needleplate in position in itsguideway 54. The" work plate is'provided with two slots-or rather withan' l.. shaped' opening 64 inone slotted portion* 65, of which theprojectioir'tgfrom the needle plate/is" designed to reciprocate and tobe guided substantially free of vibratory movement. The other slottedportion 6.6 is designed to contain the feeder 50" which likewise ismounted for reciproeatory movement transversely of the length of themain shaft and designed likewise tobeheld against vibratory movementwhile f free to reciprocate in its usual functional manner.

'VVith reference: to the adjusting connection 26 (Fig.- 6), an-eccentricpin amonnecjts the link 25' with" the rocking needle vbar frame. The pinis provided-with a spherical head 68 and socket 69" formed' partly inthe front face of the link 25 and erations of zig-zag stitching machinesof the type disclosed, in which a long dwell follows each lift of theneedle and the looper, together with the needle plate, is shifted withthe shifting of the needle. In the present disclosure power is taken offthe main shaft through the reduced gear connection to re--.

ciprocate the upstanding lever, the upper .end of which lever isconnected directly to the rocking needle bar frame and the lower endof-the lever is connected through the sliding collar with the looperbar. It is appreciated that in this way the looper shaft and the rockerarm reciprocate in synchronism. Power is transmitted directly from themain shaft to the looper bar housed therein through the broad bearingconnection provided by the split sleeve 35 so that the looper shaft isboth reciprocated and rotated through the agency of this sleeve. As thelooper shaft is contained within the maindriving shaft a long bearing isprovided therefor thus tending to minimize relativevibratory movementand the compact construction resulting therefore permits of the use of arelatively narrow work plate.

The parts on the main shaft between the long bearings 14 and 15 soapportioned among the parts taking power off of the shaft that all ofthis space is completely utilized thus tending to reduce the length ofthe machine as a whole and to take power off of the shaft at points mostconveniently available to the parts actuated therefrom.

lVhile I have shown and described, and have pointed out in the annexedclaims, certain novel features of my invention, it will be understoodthat various omissions, substitutions and changes in the form anddetails of the device illustrated and in its op eration may be made bythose skilled in the art without departing from the spirit of theinvention.

Having claim 1. In a sewing machine of the zigzag type, the combinationof a main shaft, a .looper shaft slidably journalled therein and havingan engagement with the main shaft whereby it is rotated therewith and isfree to move longitudinally with respect thereto, an upstanding leverfulcrumed intermedithus described my invention, 1

ate its ends, a needle bar frame pivoted to rock about a horizontal axisand thus cause a needle bar and needle carried thereby to trace a zigzagstitch, a link connection be tween the upper end of the lever and saidneedle bar frame, a cam driven from the main shaft and connected to saidlever intermediate its ends to rock the same, and means connecting thelower end of the lever with the looper shaft to reciprotate the samelongitudinally as it is rotated directly by the main shaft.

2. In a sewing machine of the zi zag type, the combination of a mainshaft, a looper shaft slidably journalled therein and having anengagei'nent with the main shaft whereby it is rotated therewith and isfree to move longitudinally with respect thereto, an upstanding leverfulcrurned intermediate its ends, a needle bar frame pivoted to rockabout a horizontal axis and thus cause a needle bar and needle carriedthereby to trace a zigzag stitch, a link connection between the upperend of the lever and said needle bar frame, a cam engaging the lever torock the same, a reducing gear connection between the cam and the mainshaft and means connecting the lower end of the lever with the loopershaft to reciprocate the same longitiulinally it is rotated directly bythe main shaft.

3. in a sewing machine of the zigzag type, the combination of a mainshaft, a looper shaft slidably journalled therein and having anenggement with the main shaft whereby it is rotated therewith and isfree to move longitudinally with respect thereto, an up standing leverfulcrumed intermediate its ends, a needle bar frame pivoted to rockabout a horizontal axis and thus cause a needle bar and needle carriedthereby to trace a zigzag stitch, a link connection between the upperend of the lever and said needle bar frame, a cam driven from the mainshaft and connected to said lever intermediate its ends to rock thesame, means connecting the lower end of the lever with the looper shaftto reciprocate the same longitudinally as it is rotated directly by themain shaft and a needle plate mounted for reciprocatory movement withthe needle bar frame and operatively connected with the looper shaft tomove therewith.

4-. In a sewing nnichine of'the zigzag type, the combination with asupport and mechanism mounted for reciprocatorv movement, of a mainshaft iournalled in said support and providing a suoport for thereciprocating mechanism, a gear on said shaft, a lever provided with aram engrging extension projecting laterally of its fulcrum, a cam membergeared to the main shaft gear and engaging said extension to rock thelever and means including a split sleeve slidably mounted on the mainshaft, pinned to the same to turn therewithand provided with a 1peripheral groove for receivingone end of the lever and connecting thelever with said reciprocatory mechanism on the main shaft to cause thesame to function.

5. In a sewing machine of the zigzag type,

the combination of a main shaft, a looper" shaft slidably mountedtherein and, c'onnected to rotate therewith, apower pulley fixed to saidshaft, a cam controlled lever, a gear on said shaft, a needle bar frameop- F eratively connected to be rocked from said" lever, a collarslidably mounted on the main" shaft actuated by said lever andoperatively connected to the looper shaft to reciprocate the same, afeeder actuating cam on said main shaft, a'needle plate actuating camslidably mounted on said mainshaft and a pin passing through the mainshaft and connectingthe cam with the looper shaft to reciprocatetherewith. v

6. In a sewing machine of the zigzag type, the combination of a mainshaft, means for rotating the shaft, a looper shaft slidably mountedinthe main shaft and. having a long bearing therein, mechanism forreciprocat ingthe looper shaft from the rotary movemovement, apart ofsaid main shaft pro-' surface, a split sleeve slidably the main shaftand including ment of the main shaft said mechanism including a yokecollar slidably mounted on the main shaft, a lever pivoted intermediate3 its length and with one end engaged in the collar to reciprocate thesame, means for fixing the collar to the looper shaft, means for drivingthe collar from the main shatt, a

gear on the main shaft and a cam driven from said gear and operatwelyconnected to the lever to reciprocate the same.

7. In a sewing machine of the zigzag type, the combination of a mainshaft, means for rotating the shaft, a looper shaft slidably mounted inthe main shaft and having a long bearing therein, mechanism for reciprorating the looper shaft from the rotary movement of the main shaft, saidmechanism including a yoke collar slidably mounted on the main shaft,and having a. 1'ieripheral, groove. a lever engaging in said groove toreciprocate the collar, a cam' controlled -Ineans driven from the mainshaft and opv idecl on the outer side thereof with a flat mounted on asegmental part with a flat face engaging the flat sur face on the shaftthereby to provide a broad bearing between the sleeve and shaft tonect-ed looper shaft.

main shaft to transmit the rotary-movement I of the shaft to thesleeve-,theflat contacting main shaft connected to thelcopenslfaft 'andy transmit rotary torque' from one to the other, means connecting thesleeve withthe looper shaft 1 and means driven from the main shaft forreciprocating said I sleeve and its con- 9. In a sewing machineof thezigzag-type, thecombination: of a main sh'aft p-rovided with alongitudinally extending slot; a looper shaft mounted in the mainshaftfor relative longitudinal movement, awokesleeve slidably mounted on themain -fishaft and splitalong aplane offset from-its axes of rotation,means passing through the slot for connecting the sleeve and loopershafta-th ereby to reciprocate the-looper shaft from-tite sleeve, meansfor reciprocating the 'yoke sleeve, and said sleeve and: shafthaving aflat contacting portion providing a broad bearing connection betweenthesleeve-and portion between the sleeve" and: main shaft being offsetfrom the split betweenthe parts of the yoke sleeve.

10; In a sewing machine of thewzigzagwo type, thecombination of a 'main'sh aftg a looper shaftjournalled therein for relative "longitudinalmovement, means including a sleeve slidably mounted on thefmain sliaft,directly rotated 1 thereby and pinned te t-herlooper shaft forreciproc'ating the looper shaft fromthe main-shaft,.a-'-"needle--'plate' mounted for reciprocatory movement, apl atecontrol-ling sleeve slidably mounted "on the to the needle plate tocause the needleplatc" to reciprocate with and by the 100136 1" shaft!11. In a device of the-class -desc'ribed-, 'the* combination of a frame,a main shaft-jour-' nalled in the frame, a looper shaft having longbearing inthe main shaftg -means for rotating the main shaft, arota-ry-'driving; connection between the mainslfa'ft' and= thej contained loopershaft, means-driven from the main shaft for reciprocating-' the loo ershaft and aneedle plate mounted for recip ro'catory movement andconnecting? *meansf passing through the mainshaft for a'ctuat ing theneedle plate fromtheloopen-shaft.

12. In a device ofthe class described, the

combination of a frame, a main sh aft journailed in the frame, aloopershaft having a long bearing in the mainshaft, means for rotatingthe main shaft, a rotary-driving connection'betweenthe main shaft andthe contained looper shaft, means driven from on the main shaft betweensaid reciprocating needle plate connectingmetrns and the looper shaftreciprocating'means, I

13. In a device of the class described, the combination of a supportprovided with a needle plate guideway, a needle plate'slidably mountedin said guideway and provided with an extension having a needlereceiving hole therein, a work plate positioned on said support andacting to secure the needle plate in the guideway, said work plate provided With a slot for receiving said extension from the needle plate, amain shaft journalled in the support, a looper shaft journalled in themain shaft, a looper carried by the looper shaft below the work plateand means for reciprocating the needle plate from the loopershaft.

14. In a device of the class described, the combination of a supportprovided with a needle plate guideway, a needle plate slidably mountedin said guideway and provided with an exiension h aving a needle receiving hole therein, a work plate positioned on said support and actingto secure the needle plate in the guideway, said work plate providedwith a slot for receiving said extension from the needle plate, a mainshaft journalled in the support, a looper shaft journalled in the mainshaft, a looper car ried by the looper shaft below the work plate, meansfor reciprocating the needle plate from the looper shaft, said workplate als provided with a feeder slot, a feeder mounted to reciprocatein said feeder slot and means for actuating the feeder.

Signed at New York city, in the county of New York and State of NewYork, this 26th day of July, A. D. 1920.

JOSEPH KORNAS.

